11 



the higher plants and that many vital functions 

 can go on for days or weeks in the entire absence 



1. The earlier literature is open to 

 question because of the possible presence of micro- 

 organisms. For reviews see Pfeffer,- hysiology of 

 Plants, vol. 1, pp. 538-559 (1900) and Hill,- Jornell 

 Agr. Exp. Sta. t Ball. 350 . pp. 379-387 (1913). Of the 

 very voluminous recent literature see especially; 

 Detmer,- Ber. deut. bot. Ges., 10: 201-205 (1892); 

 Pailadin,- Hev. gen. bot.__6: 201 (1894), Pflanzen- 

 physiologie, pp. 201-202 (1911); ladin and Kostytschew,. 

 Zeits. physiol. Ghem. 48: 214-259 (1906); Kostytschew,- 

 Ber. deut. bot. Ges. 2£: 527 (1902), 24: 456 (1906), 

 25 : 178 (1907), 26a : 167 (1908), Scripts Bontanica 25: 

 (1907); Godlewski and Polzenius,- Bull. ^cad. sci. 



Gracovie : 267 (1897), : 227 (1901); ITabokikh,- 



Zh.ur, Opyt. Agron. 4j_ 696-713 (1905), Ber. deut. bot. Ges. 

 LI: 467-476 (1903), Landw. Jahrb. 58: 51-194 (1909); 

 lesser,- Ergeb. Physiol. 8: 742-796 (1909); Lehman, - 

 Jahrb. wiss. Bot . >j : 61-90 (1911). liostytsche.. - "ipta 

 Bot., loc . ci t . ) and Uabokikh (Landw. Jahrb., loc. cit. ) 

 give bibliographies of further literature. 



